package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisConstants;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

import java.util.List;
import java.util.stream.Collectors;

import static com.hmdp.utils.RedisConstants.CACHE_SHOPTYPE_KEY;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result queryTypeList() {
        // 1.select from redis
        List<String> shopTypeStrList = stringRedisTemplate.opsForList().range(CACHE_SHOPTYPE_KEY, 0, -1);
        // 2.redis have data
        if (shopTypeStrList != null && !shopTypeStrList.isEmpty()) {
            List<ShopType> list = shopTypeStrList.stream()
                    .map(json -> JSONUtil.toBean(json, ShopType.class))
                    .collect(Collectors.toList());
            return Result.ok(list);
        }
        // 3.select from mysql
        List<ShopType> shopTypeList = query().orderByAsc("sort").list();
        // 4.mysql no data
        if (shopTypeList == null || shopTypeList.isEmpty()) {
            return Result.fail("shoptype is no exist");
        }
        // 5. save to redis catch
        List<String> collect = shopTypeList.stream().map(JSONUtil::toJsonStr).collect(Collectors.toList());
        stringRedisTemplate.opsForList().rightPushAll(CACHE_SHOPTYPE_KEY, collect);
        // 6.retun data
        return Result.ok(shopTypeList);
    }
}